Abstract
Dark synthesis of anthocyanin in Sinapis alba seedlings is greatly promoted by short treatments with n-propanol. The effect of n-propanol treatment is reversed by subsequent far-red light pulses. Photoreversibility kinetics suggest that n-propanol and red light act in the same way. However, phytochrome measurements and other control experiments suggest that n-propanol treatment does not lead to significant Pfr production, nor does it increase the effectiveness of any ‘dark’ Pfr present in the seedlings. The findings are difficult to explain in terms of Pfr as the sole effector of this phytochrome-mediated response.
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